AIKIDO-2026-720159

TL;DR

Electron's cache for sandboxed preload scripts did not verify that a cached entry actually matched the preload it was being served for. A compromised renderer could plant a cache entry that later gets served and executed as a different preload script, running its own code in the preload context on a later load. This only requires an already compromised renderer to write the poisoned cache entry. The fix validates cached preload entries against browser recorded source data and isolates entries by frame, site, BrowserContext, and process lock.